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Glucosamine (C 6 H 13 NO 5) is an amino sugar and a prominent precursor in the biochemical synthesis of glycosylated proteins and lipids. Glucosamine is part of the structure of two polysaccharides, chitosan and chitin. Glucosamine is one of the most abundant monosaccharides. [2]
D-Glucosamine is made naturally in the form of glucosamine-6-phosphate, and is the biochemical precursor of all nitrogen-containing sugars. [1] To be specific, glucosamine-6-phosphate is synthesized from fructose 6-phosphate and glutamine [2] as the first step of the hexosamine biosynthesis pathway. [3]
O-GlcNAcylation is the process of adding a single N-acetylglucosamine sugar to the serine or threonine of a protein. [4] Comparable to phosphorylation, addition or removal of N-acetylglucosamine is a means of activating or deactivating enzymes or transcription factors. [4]
A significant amount of research has been performed on glycosaminoglycans, especially glucosamine and chondroitin, for the treatment of arthritis.These compounds are commonly marketed as nutritional supplements and numerous 'soft therapeutic claims' are made about their health benefits - especially in aging populations. [1]
Glucosamine. In organic chemistry, an amino sugar is a sugar molecule in which a hydroxyl group has been replaced with an amine group.More than 60 amino sugars are known, with one of the most abundant being N-acetyl-D-glucosamine (a 2-amino-2-deoxysugar), which is the main component of chitin.
Members of the glycosaminoglycan family vary in the type of hexosamine, hexose or hexuronic acid unit they contain (e.g. glucuronic acid, iduronic acid, galactose, galactosamine, glucosamine). They also vary in the geometry of the glycosidic linkage. Examples of GAGs include:
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In enzymology, a glucosamine N-acetyltransferase (EC 2.3.1.3) is an enzyme that catalyzes the chemical reaction. acetyl-CoA + D-glucosamine CoA + N-acetyl-D-glucosamine. Thus, the two substrates of this enzyme are acetyl-CoA and D-glucosamine, whereas its two products are CoA and N-acetyl-D-glucosamine.
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